Are you sure you don't have another specific style that does this?
Here is what your HTML file looks like in the file on the site that I use for Font Awesome:

Notice how the icons and text are displayed. This is your original image with the lines added:

It looks like you have a style defined somewhere that removes the Font Awesome stylish style.
You can also try adding Awesome to the original font style (starting with font-awesome.css ) to see if this allows it temporarily:
li [class^="icon-"], .nav li [class^="icon-"], li [class*=" icon-"], .nav li [class*=" icon-"] { display: inline-block; width: 1.25em; text-align: center; }
adrianbanks May 17 '13 at 8:57 2013-05-17 08:57
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